merlin6-users - Re: [[merlin6-users]] AFS migration to NFS - schedule and testing

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Re: [[merlin6-users]] AFS migration to NFS - schedule and testing

From: "Caubet Serrabou, Marc" <marc.caubet AT psi.ch>
To: "merlin6-users AT lists.psi.ch" <merlin6-users AT lists.psi.ch>, "gwendolen-users AT lists.psi.ch" <gwendolen-users AT lists.psi.ch>
Cc: Merlin Admins <merlin-admins AT lists.psi.ch>
Subject: Re: [[merlin6-users]] AFS migration to NFS - schedule and testing
Date: Mon, 19 Oct 2026 04:53:16 +0000
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Dear Merlin6 users,

The intervention on merlin-l-001 is finished. Please let us know on any issues.

As mentioned, from tomorrow we will start rolling out the switch to NFS on the compute nodes by draining, applying the new configurations, and rebooting the nodes.

Best,

Marc Caubet Serrabou
_________________________________________________________

High Performance Computing & Emerging Technologies

Paul Scherrer Institut
Building/Room: OBBA/230

Forschungsstrasse, 111

5232 Villigen PSI
Switzerland

Telephone: +41 56 310 46 67
E-Mail: marc.caubet AT psi.ch

From: Caubet Serrabou, Marc
Sent: Thursday, October 15, 2026 1:41 PM
To: merlin6-users AT lists.psi.ch <merlin6-users AT lists.psi.ch>; gwendolen-users AT lists.psi.ch <gwendolen-users AT lists.psi.ch>
Cc: Merlin Admins <merlin-admins AT lists.psi.ch>
Subject: AFS migration to NFS - schedule and testing

Dear Merlin6 users,

Following our previous announcement regarding the AFS shutdown, we would like to inform you about the upcoming migration steps on Merlin6.

merlin-l-002 has already been migrated to NFS and is available for testing. We strongly encourage you to test Pmodules, and report any issues by tomorrow, Friday, October 16. Although the installation has been fully synchronized (with some exceptions, please read below), some residual AFS dependencies may remain.

We plan to migrate the primary login node, merlin-l-001, on Monday morning. Tomorrow Friday, 16 October, from 17:00, new logins to merlin-l-001 will be disabled. On Monday, October 19, morning, remaining sessions on merlin-l-001 will be terminated, and the node will be migrated and rebooted.

Starting Tuesday, 20 October, compute nodes will be progressively drained, migrated to NFS, and returned to production to minimize disruption. If your group would like to test the new setup in advance, please let us know so we can arrange for a node in your partition to be migrated ahead of the rollout. Similarly, if your group would prefer to postpone the migration, please inform us in advance so we can adjust the schedule accordingly. Please note that all nodes must be migrated before the end of October.

Finally, we would like to update that nuclear software has not been migrated, as we expect these installations to be maintained by the responsible groups in private directories on Merlin6. If you still require this software on Merlin6 coming from central Pmodules, please contact us and we will provide a solution.

Thank you for your cooperation and best regards,
The Merlin Admins